Method for rejuvenating a catalyst of a hydroprocessing and/or hydrocracking process

A process for the rejuvenation of an at least partially spent catalyst resulting from a hydrotreating and/or hydrocracking process, said at least partially spent catalyst resulting from a fresh catalyst comprising at least one metal from group VIII, at least one metal from group VIb, an oxide support, and optionally phosphorus, said process comprising

• a) regenerating the at least partially spent catalyst in an oxygen-containing gas stream at a temperature of between 300° C. and 550° C., so as to obtain a regenerated catalyst,
• b) bringing said regenerated catalyst into contact with an aqueous impregnation solution, which contains only water, phosphoric acid and an organic acid, wherein phosphoric acid and the organic acid each have an acidity constant pKa greater than 1.5,
• c) then drying said regenerated catalyst in a drying stage at a temperature of less than 200° C., without subsequently calcining said regenerated catalyst, so as to obtain a rejuvenated catalyst.